Eggs – Making the meringues form peaks

The eggs whites in traditional meringues are used to spread the sugar into a thin foam that is then dried in the oven (or dehydrator) leaving behind the sugar structure and some proteins from the eggs. To make a meringue you need something that dissolves to tangle up with those proteins. I would guess that the beet meringues from Café Atlantico are made with beet powder replacing the sugar with the goat cheese in the middle adding to the sense of savory.

I have never made savory meringues, but if I were to experiment I would mix freshly whipped eggs whites with sugar to those created by reducing a savory liquid and then adding powder egg whites to it.

There are two likely causes of soufflé problems.

1) Egg foam. Be sure that you're whipping them to peaks (soft peaks, as I recall) when you first whip them. Then, when adding the 2 mixtures together in 3rds, be sure that you're properly folding in the whites; this is a very specific technique, and easy to over-do.

2) Oven heat. Use an oven thermometer to check your oven's temp - it's probably wrong. Put some extra mass in that oven (like a baking stone or brick) to reduce wild temperature swings during baking.

But, as in the linked questions in the comments, all soufflés fall to some degree.